223121231212 has 24 divisors (see below), whose sum is σ = 426092888592. Its totient is φ = 101386795200.

The previous prime is 223121231171. The next prime is 223121231213. The reversal of 223121231212 is 212132121322.

It is a super-3 number, since 3×223121231212³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (223121231213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657103 + ... + 937030.

It is an arithmetic number, because the mean of its divisors is an integer number (17753870358).

Almost surely, 2^223121231212 is an apocalyptic number.

223121231212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

223121231212 is a deficient number, since it is larger than the sum of its proper divisors (202971657380).

223121231212 is a wasteful number, since it uses less digits than its factorization.

223121231212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597329 (or 1597327 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

Adding to 223121231212 its reverse (212132121322), we get a palindrome (435253352534).

The spelling of 223121231212 in words is "two hundred twenty-three billion, one hundred twenty-one million, two hundred thirty-one thousand, two hundred twelve".